Method ZipMap

ZipMap<TSource, TResult>(IAsyncEnumerable<TSource>, Func<TSource, TResult>)

Applies a function to each element in a sequence and returns a sequence of tuples containing both the original item as well as the function result.

Declaration

public static IAsyncEnumerable<(TSource item, TResult result)> ZipMap<TSource, TResult>(this IAsyncEnumerable<TSource> source, Func<TSource, TResult> selector)

Parameters

Type	Name	Description
IAsyncEnumerable<TSource>	source	A sequence of values to invoke a transform function on
Func<TSource, TResult>	selector	A transform function to apply to each source element

Returns

Type	Description
IAsyncEnumerable<(TSource item, TResult result)>	An IAsyncEnumerable<T> whose elements are a tuple of the original element and the item returned from calling the selector on that element.

Type Parameters

Name	Description
TSource	The type of the elements of source
TResult	The type of the value returned by selector

Exceptions

Type	Condition
ArgumentNullException	source is null.
ArgumentNullException	selector is null.

ZipMap<TSource, TResult>(IAsyncEnumerable<TSource>, Func<TSource, ValueTask<TResult>>)

Applies a function to each element in a sequence and returns a sequence of tuples containing both the original item as well as the function result.

Declaration

public static IAsyncEnumerable<(TSource item, TResult result)> ZipMap<TSource, TResult>(this IAsyncEnumerable<TSource> source, Func<TSource, ValueTask<TResult>> selector)

Parameters

Type	Name	Description
IAsyncEnumerable<TSource>	source	A sequence of values to invoke a transform function on
Func<TSource, ValueTask<TResult>>	selector	A transform function to apply to each source element

Returns

Type	Description
IAsyncEnumerable<(TSource item, TResult result)>	An IAsyncEnumerable<T> whose elements are a tuple of the original element and the item returned from calling the selector on that element.

Type Parameters

Name	Description
TSource	The type of the elements of source
TResult	The type of the value returned by selector

Exceptions

Type	Condition
ArgumentNullException	source is null.
ArgumentNullException	selector is null.

ZipMap<TSource, TResult>(IAsyncEnumerable<TSource>, Func<TSource, CancellationToken, ValueTask<TResult>>)

Applies a function to each element in a sequence and returns a sequence of tuples containing both the original item as well as the function result.

Declaration

public static IAsyncEnumerable<(TSource item, TResult result)> ZipMap<TSource, TResult>(this IAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, ValueTask<TResult>> selector)

Parameters

Type	Name	Description
IAsyncEnumerable<TSource>	source	A sequence of values to invoke a transform function on
Func<TSource, CancellationToken, ValueTask<TResult>>	selector	A transform function to apply to each source element

Returns

Type	Description
IAsyncEnumerable<(TSource item, TResult result)>	An IAsyncEnumerable<T> whose elements are a tuple of the original element and the item returned from calling the selector on that element.

Type Parameters

Name	Description
TSource	The type of the elements of source
TResult	The type of the value returned by selector

Exceptions

Type	Condition
ArgumentNullException	source is null.
ArgumentNullException	selector is null.